19 October 2016 TIRCIS: thermal infrared compact imaging spectrometer for small satellite applications
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Abstract
Measurements of reflectance or emittance in tens of narrow, contiguous wavebands, allow for the derivation of laboratory quality spectra remotely, from which the chemical composition and physical properties of targets can be determined. Although spaceborne (e.g. EO-1 Hyperion) hyperspectral data in the 0.4-2.5 micron (VSWIR) region are available, the provision of equivalent data in the log-wave infrared has lagged behind, there being no currently operational high spatial resolution LWIR imaging spectrometer on orbit. TIRCIS (Thermal Infra-Red Compact Imaging Spectrometer), uses a Fabry-Perot interferometer, an uncooled microbolometer array, and push-broom scanning to acquire hyperspectral image data. Radiometric calibration is provided by blackbody targets while spectral calibration is achieved using monochromatic light sources. The instrument has a mass of <15 kg and dimensions of 53 cm × 25 cm ♦ 22 cm, and has been designed to be compatible with integration into a micro-satellite platform. (A precursor to this instrument was launched onboard a 55 kg microsatellite in October 2015). The optical design yields a 120 m ground sample size given an orbit of 500 km. Over the wavelength interval of 7.5 to 14 microns up to 50 spectral samples are possible. Measured signal-to-noise ratios range from peak values of 500:1 to 1500:1, for source temperature of 10 to 100°C.
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Robert Wright, Robert Wright, Paul Lucey, Paul Lucey, Sarah Crites, Sarah Crites, Harold Garbeil, Harold Garbeil, Mark Wood, Mark Wood, Eric Pilger, Eric Pilger, Andrea Gabrieli, Andrea Gabrieli, Casey Honniball, Casey Honniball, "TIRCIS: thermal infrared compact imaging spectrometer for small satellite applications", Proc. SPIE 10000, Sensors, Systems, and Next-Generation Satellites XX, 100000M (19 October 2016); doi: 10.1117/12.2241931; https://doi.org/10.1117/12.2241931
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